Wetsuit materials explained

Natural rubber — Yulex and OCENA

The biggest shift in wetsuit materials is the move to plant-based rubber from hevea trees. Two main options exist: Yulex (pioneered by Patagonia, now used by Billabong, needessentials, SRFACE, WALLIEN, Finisterre, and others) and OCENA (developed by SHEICO, the world's largest wetsuit manufacturer).

Standard Yulex is 85% natural rubber, 15% synthetic rubber by polymer content, FSC-certified. Yulex 2.0, the latest generation, offers improved stretch and rebound. In 2024, Decathlon launched Yulex100 — the first wetsuit material made from 100% certified natural rubber with zero synthetic rubber.

OCENA uses natural rubber from hevea trees, enriched with oyster shell powder (replacing limestone), soybean oil, and recycled carbon black from scrap tires. It's certified up to 82% bio-based by the USDA. Because SHEICO manufactures for most major brands, OCENA gives the entire industry access to plant-based rubber at scale.

Both perform comparably to neoprene with a significantly lower carbon footprint. Natural rubber is not yet 100% sustainable — linings, thread, glue, and accessories still contain synthetics — but it's the most meaningful step forward the industry has taken.

Limestone neoprene

Starting in the 1990s, Yamamoto Corporation in Japan pioneered a process to make neoprene from calcium carbonate (limestone) instead of petroleum. The resulting rubber — marketed as Geoprene — is lighter, more flexible, and better at insulating than petroleum-based neoprene. Today, most mid-to-premium wetsuits use limestone neoprene.

It's an improvement over petroleum, but it's still synthetic. Limestone mining carries its own environmental costs, and the manufacturing process still requires significant energy. Yamamoto's premium grades — #39 and #40 — remain the benchmark for high-end wetsuit rubber.

Neoprene (petroleum-based)

The original. Neoprene is a synthetic rubber invented by DuPont chemist Wallace Carothers in 1930 and used in wetsuits since the early 1950s. It's made by polymerising chloroprene — a chemical compound derived from crude oil — into polychloroprene chips, mixing them with carbon black and blowing agents, then baking the mixture in an oven. The blowing agents cause the rubber to expand, creating millions of tiny gas bubbles that give neoprene its insulation, flexibility, and buoyancy.

Petroleum neoprene has been the industry standard for over 70 years because it works. It stretches well, insulates reliably, and lasts multiple seasons with decent care. The downsides are environmental — oil extraction, energy-intensive manufacturing, and toxic emissions during production. Most of the world's chloroprene comes from Denka in Japan. Their controversial US plant in Louisiana — located in what's known as Cancer Alley — suspended production in 2025 after years of scrutiny over chloroprene emissions linked to elevated cancer risks.

What about allergies?

Natural rubber can trigger skin allergies in some people. Yulex claims 99% purity (hypoallergenic), but if you have known latex sensitivity, check the specific type before buying. Neoprene and limestone suits don't carry the same risk.

Smoothskin

Some suits feature panels of unlined rubber on the outside — usually on the chest and back. This is called smoothskin. It sheds wind and water instantly because there's no jersey for wind to penetrate or water to cling to. Common on kitesurf and windsurf wetsuits. The trade-off: smoothskin tears more easily. Fingernails and velcro will damage it. Handle with care.

Linings

Both the inside and outside of wetsuit rubber are laminated with fabric — usually nylon or polyester — for strength, comfort, and easier on-off. Inner linings vary significantly by price bracket. Budget suits use basic jersey. Mid-range and above use plush linings — thick polyester fleece that creates insulating air pockets and dries faster. Premium suits use graphene-infused linings that redistribute body heat more evenly.

One honest note: plush linings lose performance over time. The fibres flatten with use, the suit retains more water, and it dries slower. A two-season-old plush suit won't feel like a new one.

Colours and dope dyeing

Wetsuits have been mostly black for the last 15 years, partly because carbon black pigment gives rubber its colour and strength naturally. Coloured suits are coming back, mostly in pastel tones. Modern colouring uses dope dyeing (solution dyeing) — pigment is melted into the plastic before it's spun into thread, rather than dyeing fabric in water baths afterward. It uses far less water and the colour lasts longer.

The bottom line

If you're buying new, natural rubber (Yulex or OCENA) is the better choice for the planet without sacrificing performance. If that's out of your budget, limestone neoprene is the next best option. Petroleum neoprene still works fine — it's just harder to justify when alternatives exist at similar price points.

Whatever material you choose, how you care for it matters more for longevity than what it's made of.